US20200338224A1

US20200338224A1 - Decorative combustion device capable of emitting fragrance

Info

Publication number: US20200338224A1
Application number: US16/505,809
Authority: US
Inventors: Wei Cheng Wu
Original assignee: Pro Iroda Industries Inc
Current assignee: Pro Iroda Industries Inc
Priority date: 2019-04-24
Filing date: 2019-07-09
Publication date: 2020-10-29
Also published as: AU2019264615A1; AU2019264615B2; US11033650B2; EP3730157A1; EP3730157B1

Abstract

A combustion device comprises a burner and a fragrance diffuser. The burner is provided with a top end having a combustion portion. The fragrance diffuser includes a support and a holder adapted to hold a fragrance substance. The support is disposed on the top end and has an inner wall and an outer wall. The inner wall is arranged around the combustion portion, and the outer wall is arranged around the inner wall. A holding space is formed between the inner wall and the outer wall. The holder is disposed in the holding space. Thus, the combustion device is not only for decorative purpose, but also able to emit fragrance. Further, the fragrance diffuser can function as a windshield of the burner.

Description

BACKGROUND

The present invention relates to a combustion device and, more particular, to a decorative combustion device capable of emitting fragrance.
Taiwan Utility Model Publication No. M451141 issued on Apr. 21, 2013 discloses a burner including a heating base having an accommodation space, a fragrance capsule placed in the accommodation space, and a covering member covering the fragrance capsule. The fragrance capsule includes a heat resistant container in contact with the heating base and having an opening, a fragrance block disposed in the heat resistant container, and a sealing cover sealing the opening to seal the fragrance block in the heat resistant container. In use, the sealing cover can be first torn, and then the heat resistant container with the fragrance block is placed in the accommodating space.
However, the foregoing burner used electric to heat the fragrance capsule to emit fragrance. It takes a very long time for the entire indoor space to be full of fragrance.
Thus, a need exists for a novel combustion device to mitigate and/or obviate the above disadvantages.

SUMMARY

In a first aspect, a combustion device according to the present invention comprises a burner and a fragrance diffuser. The burner is provided with a top end having a combustion portion. The fragrance diffuser includes a support and a holder adapted to hold a fragrance substance. The support is disposed on the top end and is provided with an inner wall and an outer wall. The inner wall extends in a vertical direction and is arranged around the combustion portion. The outer wall extends in the vertical direction and is arranged around the inner wall. A holding space is formed between the inner wall and the outer wall, and the holder is disposed in the holding space.
In an example, the burner is provided with a bottom end opposite to the top end. The burner includes a fuel container and a wick. The fuel container includes a wide portion adjacent to the bottom end, and a narrow portion adjacent to the top end. A width of the narrow portion is less than a width of the wide portion in a horizontal direction. An end of the narrow portion opposite to the wide portion is provided with an opening. A first end of the wick is inserted into the fuel container via the opening, and a second end of the wick is disposed in the combustion portion. The inner wall is arranged around the narrow portion, and an end of the inner wall adjacent to the burner is abutted against an outer end face located at a side of the wide portion adjacent to the narrow portion.
In an example, the support is provided with at least one connection rib extending in the vertical direction and disposed in the holding space. A first end of the at least one connection rib is connected to the inner wall, and a second end of the at least one connection rib is connected to the outer wall in the horizontal direction. The holder includes two recesses, and a hanging portion arranged between the two recesses. Two ends of the hanging portion are connected to the two recesses. The hanging portion hangs on a top edge of the at least one connection rib in the vertical direction. The two recesses are located at two opposite sides of the at least one connection rib.
In an example, the support includes four connection ribs respectively extending in the vertical direction and arrayed in the holding space in a circumferential direction at angles of equal intervals. A first end of each connection rib is connected to the inner wall, and a second end of each connection rib is connected to the outer wall in the horizontal direction. The hanging portion hangs on a top edge of one of the four connection ribs in the vertical direction. The two recesses are located at two opposite sides of one of the four connection ribs.
In an example, ends of the four connection ribs adjacent to the burner abut against the outer end face located at a side of the wide portion adjacent to the narrow portion. The outer wall is not in contact with the fuel container. The holding space is communicated with the outside via a gap formed between a bottom edge of the outer wall and the fuel container in the vertical direction.
In an example, the fragrance diffuser is provided with a lid abutting an end of the inner wall opposite to the burner in the vertical direction. The lid is provided with a through hole and a plurality of penetrating holes, and the through hole corresponds to the combustion portion. An end of the holding space is communicated with the outside via the plurality of penetrating holes.
In an example, an outer periphery of the lid corresponds to an inner periphery of the outer wall in the horizontal direction.
In an example, the support is formed as a single piece. The inner wall and the outer wall are round tubular and both extend along a central axis. The four connection ribs are sheet shapes.
In a second aspect, a combustion device according to the present invention comprises a burner and a fragrance diffuser. The burner is provided with a fuel container and an opening communicated with the fuel container. The burner includes a wick and a collar assembly. The wick is inserted into the fuel container via the opening. A ring body of the collar assembly includes a lower tube portion, an upper tube portion, and a flange. The lower tube portion and the upper tube portion are mounted around the wick. The lower tube portion is inserted into the opening. The upper tube portion extends out of the opening and is connected with the lower tube portion. The flange is radially connected outer peripheries of the lower tube portion and the upper tube portion and is disposed between the lower tube portion and the upper tube portion. The fragrance diffuser is mounted on a side of the flange opposite to the lower tube portion and is disposed adjacent to an outer periphery of the upper tube portion.
In an example, the fragrance diffuser includes a holder, a fragrance substance, and a lid. The holder is mounted on the side of the flange opposite to the lower tube portion and is disposed adjacent to the upper tube portion. A side of the holder opposite to the flange is provided with a recess. The fragrance substance is disposed in the recess. The lid is disposed on the side of the holder opposite to the flange and is provided with a through hole and a plurality of penetrating holes. The through hole is mounted around the upper tube portion. The plurality of penetrating holes correspond to the recess.
In an example, an end of the upper tube portion opposite to the lower tube portion is provided with a neck. A width of the neck is less than a maximum width of the upper tube portion in a radial direction. The lid is mounted around the neck and abuts against a stepped end face of the neck adjacent to the upper tube portion.
In an example, the ring body is formed as a single piece. The lower tube portion and the upper tube portion are round tubular and both extend along a central axis. The flange is an annular sheet.
In an example, the burner includes an inner wall and an outer wall. The fuel container and the opening are disposed at the inner wall. The outer wall is arranged around the inner wall. A hollow space is formed between the inner wall and the outer wall. A bottom edge of the outer wall is provided with an aperture communicated with the hollow space in a vertical direction. The burner is connected to a base mounted with the aperture. The base is provided with an open hole communicated with the hollow space. A first side of the base is provided with a slot disposed around the open hole, and the bottom edge is inserted into the slot.
In an example, a second side of the base is provided with a bottom portion. A first side of the slot opposite to the open hole is provided with an outer edge, and first height is formed between the outer edge and the bottom portion in the vertical direction. A second side of the slot adjacent to the open hole is provided with an inner edge and a second height is formed between the inner edge and the bottom portion in the vertical direction. The second height is less than the first height.
In an example, the inner wall and the outer wall are formed as a single piece.
In an example, an inner periphery of the outer wall is not in contact with an outer periphery of the inner wall. The inner wall includes a tubular containing portion and a connection tube portion. The fuel container is disposed in the containing portion. The connection tube portion is connected to the containing portion. The opening is disposed in the connection tube portion. The outer wall includes an outer tubular portion and a connection portion. The containing portion and the outer tubular portion both extend along a central axis. A first side of the connection portion is connected to an end of the connection tube portion opposite to the containing portion, and a second side of the connection portion is connected to a top end of the outer tubular portion in the vertical direction.
In an example, the collar assembly includes a plurality of O-rings. An outer periphery of the lower tube portion opposite to the wick is provided with a plurality of grooves. The plurality of the O-rings are respectively arranged in the plurality of grooves, and sides of the plurality of the O-rings opposite to the ring body abut against an inner periphery of the connection tube portion.
In an example, the inner wall and the outer wall are made of glass and are transparent. The wick is made of metal. The ring body is made of metal or plastic.
The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The aforementioned and other aspects of the invention may best be understood by reference to the following description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a perspective view of a combustion device of a first embodiment according to the present invention.

FIG. 2 is an exploded perspective view of the combustion device of FIG. 1.

FIG. 3 is a top view of the combustion device of FIG. 1.

FIG. 4 is a cross-sectional view taken along section line 4-4 of FIG. 3.

FIG. 5 is a cross-sectional view taken along section line 5-5 of FIG. 3.

FIG. 6 is a cross-sectional view taken along section line 6-6 of FIG. 5.

FIG. 7 is a perspective view of a combustion device of a second embodiment according to the present invention.

FIG. 8 is an exploded perspective view of the combustion device of FIG. 7.

FIG. 9 is a cross-sectional view of the combustion device of FIG. 7.

FIG. 10 is an enlarged view of the combustion device of FIG. 9.

DETAILED DESCRIPTION

FIGS. 1-6 show a combustion device of a first embodiment according to the present invention. The combustion device 10 includes a burner 20 and a fragrance diffuser 30.
The burner 20 is provided with a top end 21 having a combustion portion 22.
The burner 20 is further provided with a bottom end 23 opposite to the top end 21. The burner 20 includes a fuel container 24 and a wick 25. The fuel container 24 includes a wide portion 241 adjacent to the bottom end 23, and a narrow portion 242 adjacent to the top end 21. A width of the narrow portion 242 is less than a width of the wide portion 241 in a horizontal direction. An end of the narrow portion 242 opposite to the wide portion 241 is provided with an opening 243. A first end of the wick 25 is inserted into the fuel container 24 via the opening 243, and a second end of the wick 25 is disposed in the combustion portion 22.
The fragrance diffuser 30 includes a support 31 and a holder 32 adapted to hold a fragrance substance (not shown). The support 31 is disposed on the top end 21 and is provided with an inner wall 311 and an outer wall 312. The inner wall 311 extends in a vertical direction and is arranged around the combustion portion 22 and the narrow portion 242. An end of the inner wall 311 adjacent to the burner 20 is abutted against an outer end face located at a side of the wide portion 241 adjacent to the narrow portion 242. The outer wall 312 extends in the vertical direction and is arranged around the inner wall 311. A holding space 313 is formed between the inner wall 311 and the outer wall 312, and the holder 32 is disposed in the holding space 313.
The support 31 is provided with at least one connection rib 314 extending in the vertical direction and disposed in the holding space 313. A first end of the at least one connection rib 314 is connected to the inner wall 311, and a second end of the at least one connection rib 314 is connected to the outer wall 312 in the horizontal direction. The holder 32 includes two recesses 321, and a hanging portion 322 arranged between the two recesses 321. Two ends of the hanging portion 322 are connected to the two recesses 321, and the hanging portion (322) hangs on a top edge of the at least one connection rib 314 in the vertical direction to cause the two recesses 321 located at two opposite sides of the at least one connection rib 314.
In the embodiment, the support 31 includes four connection ribs 314 respectively extending in the vertical direction and arrayed in the holding space 313 in a circumferential direction at angles of equal intervals. A first end of each connection rib 314 is connected to the inner wall 311, and a second end of each connection rib 314 is connected to the outer wall 312 in the horizontal direction. The hanging portion 322 hangs on a top edge of one of the four connection ribs 314 in the vertical direction to cause the two recesses 321 located at two opposite sides of one of the four connection ribs 314.
Ends of the four connection ribs 314 adjacent to the burner 20 abut against the outer end face located at a side of the wide portion 241 adjacent to the narrow portion 242. The outer wall 312 is not in contact with the fuel container 24. The holding space 313 is communicated with the outside via a gap formed between a bottom edge of the outer wall 312 and the fuel container 24 in the vertical direction.
The fragrance diffuser 30 is further provided with a lid 33 abutting an end of the inner wall 311 opposite to the burner 20 in the vertical direction. The lid 33 is provided with a through hole 331 and a plurality of penetrating holes 332. The through hole 331 corresponds to the combustion portion 22, and an end of the holding space 313 is communicated with the outside via the plurality of penetrating holes 332. An outer periphery of the lid 33 corresponds to an inner periphery of the outer wall 312 in the horizontal direction.
Furthermore, the support 31 may be formed as a single piece. The inner wall 311 and the outer wall 312 may be round tubular and both extend along a central axis. The four connection ribs 314 may be in sheet shapes.
The material of the support 31 can be ceramic, glass or aluminum alloy. After the burner 20 is ignited, the heat generated by the burner 20 raises the temperature of the support 31 to cause the holder 32 also be heated by the burner 20. The fragrance substance, such as fragrance wax in the holder 32 is melted by heat to emit fragrance particles, which pass through the plurality of penetrating holes 332 and is dissipated into the air. Thus, the combustion device 10 is not only for decorative purpose, but also able to emit fragrance. Further, the fragrance diffuser 30 can function as a windshield of the burner 20.
FIGS. 7-10 show a combustion device of a second embodiment according to the present invention. The combustion device 10 a includes a burner 20 a and a fragrance diffuser 30 a.
The burner 20 a includes an inner wall 21 a and an outer wall 22 a. The inner wall 21 a provided with a fuel container 211 a and an opening 212 a communicated with the fuel container 211 a. The outer wall 22 a is arranged around the inner wall 21 a, and a hollow space 23 a is formed between the inner wall 21 a and the outer wall 22 a. The inner wall 21 a and the outer wall 22 a may be formed as a single piece, and the inner wall 21 a and the outer wall 22 a are made of glass and are transparent. A bottom edge 221 a of the outer wall 22 a is provided with an aperture 24 a communicated with the hollow space (23 a) in a vertical direction.
An inner periphery of the outer wall 22 a is not in contact with an outer periphery of the inner wall 21 a. The inner wall 21 a includes a tubular containing portion 213 a and a connection tube portion 214 a. The fuel container 211 a is disposed in the containing portion 213 a. The connection tube portion 214 a is connected to the containing portion 213 a. The opening 212 a is disposed in the connection tube portion 214 a. The outer wall 22 a includes an outer tubular portion 222 a and a connection portion 223 a. The containing portion 213 a and the outer tubular portion 222 a both extend along a central axis. A first side of the connection portion 223 a is connected to an end of the connection tube portion 214 a opposite to the containing portion 213 a, and a second side of the connection portion 223 a is connected to a top end of the outer tubular portion 222 a in the vertical direction.
The burner 20 a further includes a wick 25 a and a collar assembly 26 a. The wick 25 a is inserted into the fuel container 211 a via the opening 212 a, and the wick 25 a may be made of metal.
The collar assembly 26 a includes a ring body 261 a and a plurality of O-rings 262 a. The ring body 261 a is formed as a single piece and includes a lower tube portion 263 a, an upper tube portion 264 a, and a flange 265 a. The lower tube portion 263 a and the upper tube portions 264 a are mounted around the wick 25 a. The lower tube portion 263 a is inserted into the opening 212 a. The upper tube portion 264 a extends out of the opening 212 a and is connected with the lower tube portion 263 a. The flange 265 a is radially connected outer peripheries of the lower tube portion 263 a and the upper tube portions 264 a and is disposed between the lower tube portion 263 a and the upper tube portions 264 a. Further, the lower tube portion 263 a and the upper tube portions 264 a may be round tubular and both extend along a central axis. The flange 265 a may be an annular sheet.
An outer periphery of the lower tube portion 263 a opposite to the wick 25 a is provided with a plurality of grooves 266 a, and the plurality of the O-rings 262 a are respectively arranged in the plurality of grooves 266 a. Sides of the plurality of the O-rings 262 a opposite to the ring body 261 a abut against an inner periphery of the connection tube portion 214 a. Further, the ring body 261 a may be made of metal or plastic.
An end of the upper tube portion 264 a opposite to the lower tube portion 263 a is provided with a neck 267 a. A width of the neck 267 a is less than a maximum width of the upper tube portion 264 a in a radial direction.
The burner 20 a is connected to a base 27 a mounted with the aperture 24 a. The base 27 a is provided with an open hole 271 a communicated with the hollow space 23 a. A first side of the base 27 a is provided with a slot 272 a disposed around the open hole 271 a, and the bottom edge 221 a is inserted into the slot 272 a.
A second side of the base 27 a is provided with a bottom portion 273 a. A first side of the slot 272 a opposite to the open hole 271 a is provided with an outer edge 274 a, and a first height H1 is formed between the outer edge 274 a and the bottom portion 273 a in the vertical direction. A second side of the slot 272 a adjacent to the open hole 271 a is provided with an inner edge 275 a, and a second height H2 is formed between the inner edge 275 a and the bottom portion 273 a in the vertical direction, and the second height H2 is less than the first height H1.
The fragrance diffuser 30 a is mounted on a side of the flange 265 a opposite to the lower tube portion 263 a and is disposed adjacent to an outer periphery of the upper tube portion 264 a.
The fragrance diffuser 30 a includes a holder 31 a, a fragrance substance 32 a, and a lid 33 a. The holder 31 a is mounted on the side of the flange 265 a opposite to the lower tube portion 263 a and is disposed adjacent to the upper tube portion 264 a. A side of the holder 31 a opposite to the flange 265 a is provided with a recess 311 a, and the fragrance substance 32 a is disposed in the recess 311 a. The lid 33 a is disposed on the side of the holder 31 a opposite to the flange 265 a and is provided with a through hole 331 a and a plurality of penetrating holes 332 a. The through hole 331 a is mounted around the upper tube portion 264 a, and the plurality of penetrating holes 332 a correspond to the recess 311 a. Further, the lid 33 a may be mounted around the neck 267 a to abut against a stepped end face of the neck 267 a adjacent to the upper tube portion 264 a.
After the burner 20 a is ignited, the heat generated by the burner 20 a raises the temperature of the ring body 261 a to cause the holder 31 a also be heated by the burner 20 a. The fragrance substance 32 a, such as fragrance wax in the holder 31 a is melted by heat to emit fragrance particles, which pass through the plurality of penetrating holes 332 a and is dissipated into the air. Thus, the combustion device 10 a is not only for decorative purpose, but also able to emit fragrance.
The combustion device 10 a can achieve a good heat insulation effect by a two-layer structure formed from the inner wall 21 a and the outer wall 22 a. Although the center of gravity of the two-layer structure of the burner 20 a will be slightly higher, but the base 27 a mounted on the bottom edge 221 a of the burner 20 a can lower the center of gravity of the burner 20 a to prevent the combustion device 10 a being tipped over. Moreover, the most fragile position of the glass material is at the edges and the corners, so that the bottom edge 221 a is covered by the base 27 a to prevent the burner 20 a being easily damaged.
While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. For example, any of the elements associated with the privacy summary may employ any of the desired functionality set forth hereinabove. Thus, the breadth and scope of a preferred embodiment should not be limited by any of the above-described exemplary embodiments.

Claims

What is claimed is:

1. A combustion device comprising:

a burner provided with a top end having a combustion portion;

a fragrance diffuser including a support and a holder adapted to hold a fragrance substance, with the support disposed on the top end and provided with an inner wall and an outer wall, with the inner wall extending in a vertical direction and arranged around the combustion portion, with the outer wall extending in the vertical direction and arranged around the inner wall, with a holding space formed between the inner wall and the outer wall, and with the holder disposed in the holding space.

2. The combustion device as claimed in claim 1, wherein the burner is provided with a bottom end opposite to the top end, wherein the burner includes a fuel container and a wick, wherein the fuel container includes a wide portion adjacent to the bottom end, and a narrow portion adjacent to the top end, wherein a width of the narrow portion is less than a width of the wide portion in a horizontal direction, wherein an end of the narrow portion opposite to the wide portion is provided with an opening, wherein a first end of the wick is inserted into the fuel container via the opening, wherein a second end of the wick is disposed in the combustion portion, wherein the inner wall is arranged around the narrow portion, and wherein an end of the inner wall adjacent to the burner is abutted against an outer end face located at a side of the wide portion adjacent to the narrow portion.

3. The combustion device as claimed in claim 2, wherein the support is provided with at least one connection rib extending in the vertical direction and disposed in the holding space, wherein a first end of the at least one connection rib is connected to the inner wall, wherein a second end of the at least one connection rib is connected to the outer wall in the horizontal direction, wherein the holder includes two recesses, and a hanging portion arranged between the two recesses, wherein two ends of the hanging portion are connected to the two recesses, wherein the hanging portion hangs on a top edge of the at least one connection rib in the vertical direction, and wherein the two recesses are located at two opposite sides of the at least one connection rib.

4. The combustion device as claimed in claim 3, wherein the support includes four connection ribs respectively extending in the vertical direction and arrayed in the holding space in a circumferential direction at angles of equal intervals, wherein a first end of each connection rib is connected to the inner wall, wherein a second end of each connection rib is connected to the outer wall in the horizontal direction, wherein the hanging portion hangs on a top edge of one of the four connection ribs in the vertical direction, and wherein the two recesses are located at two opposite sides of one of the four connection ribs.

5. The combustion device as claimed in claim 4, wherein ends of the four connection ribs adjacent to the burner abut against the outer end face located at a side of the wide portion adjacent to the narrow portion, wherein the outer wall is not in contact with the fuel container, and wherein the holding space is communicated with the outside via a gap formed between a bottom edge of the outer wall and the fuel container in the vertical direction.

6. The combustion device as claimed in claim 1, wherein the fragrance diffuser is provided with a lid abutting an end of the inner wall opposite to the burner in the vertical direction, wherein the lid is provided with a through hole and a plurality of penetrating holes, wherein the through hole corresponds to the combustion portion, and wherein an end of the holding space is communicated with the outside via the plurality of penetrating holes.

7. The combustion device as claimed in claim 6, wherein an outer periphery of the lid corresponds to an inner periphery of the outer wall in the horizontal direction.

8. The combustion device as claimed in claim 5, wherein the support is formed as a single piece, wherein the inner wall and the outer wall are round tubular and both extend along a central axis, and wherein the four connection ribs are sheet shapes.

9. A combustion device comprising:

a burner provided with a fuel container and an opening communicated with the fuel container, with the burner including a wick and a collar assembly, with the wick inserted into the fuel container via the opening, with a ring body of the collar assembly including a lower tube portion, an upper tube portion, and a flange, with the lower tube portion and the upper tube portion mounted around the wick, with the lower tube portion inserted into the opening, with the upper tube portion extending out of the opening and connected with the lower tube portion, with the flange radially connected outer peripheries of the lower tube portion and the upper tube portion and disposed between the lower tube portion and the upper tube portion; and

a fragrance diffuser mounted on a side of the flange opposite to the lower tube portion and disposed adjacent to an outer periphery of the upper tube portion.

10. The combustion device as claimed in claim 9, wherein the fragrance diffuser includes a holder, a fragrance substance, and a lid, wherein the holder is mounted on the side of the flange opposite to the lower tube portion and disposed adjacent to the upper tube portion, wherein a side of the holder opposite to the flange is provided with a recess, wherein the fragrance substance is disposed in the recess, wherein the lid is disposed on the side of the holder opposite to the flange and is provided with a through hole and a plurality of penetrating holes, wherein the through hole is mounted around the upper tube portion, and wherein the plurality of penetrating holes correspond to the recess.

11. The combustion device as claimed in claim 10, wherein an end of the upper tube portion opposite to the lower tube portion is provided with a neck, wherein a width of the neck is less than a maximum width of the upper tube portion in a radial direction, and wherein the lid is mounted around the neck and abuts against a stepped end face of the neck adjacent to the upper tube portion.

12. The combustion device as claimed in claim 10, wherein the ring body is formed as a single piece, wherein the lower tube portion and the upper tube portion are round tubular and both extend along a central axis, and wherein the flange is an annular sheet.

13. The combustion device as claimed in claim 9, wherein the burner includes an inner wall and an outer wall, wherein the fuel container and the opening are disposed at the inner wall, wherein the outer wall is arranged around the inner wall, wherein a hollow space is formed between the inner wall and the outer wall, wherein a bottom edge of the outer wall is provided with an aperture communicated with the hollow space in a vertical direction, wherein the burner is connected to a base mounted with the aperture, wherein the base is provided with an open hole communicated with the hollow space, wherein a first side of the base is provided with a slot disposed around the open hole, and wherein the bottom edge is inserted into the slot.

14. The combustion device as claimed in claim 13, wherein a second side of the base is provided with a bottom portion, wherein a first side of the slot opposite to the open hole is provided with an outer edge, wherein a first height is formed between the outer edge and the bottom portion in the vertical direction, wherein a second side of the slot adjacent to the open hole is provided with an inner edge, wherein a second height is formed between the inner edge and the bottom portion in the vertical direction, and wherein the second height is less than the first height.

15. The combustion device as claimed in claim 13, wherein the inner wall and the outer wall are formed as a single piece.

16. The combustion device as claimed in claim 13, wherein an inner periphery of the outer wall is not in contact with an outer periphery of the inner wall, wherein the inner wall includes a tubular containing portion and a connection tube portion, wherein the fuel container is disposed in the containing portion, wherein the connection tube portion is connected to the containing portion, wherein the opening is disposed in the connection tube portion, wherein the outer wall includes an outer tubular portion and a connection portion, wherein the containing portion and the outer tubular portion both extend along a central axis, wherein a first side of the connection portion is connected to an end of the connection tube portion opposite to the containing portion, and wherein a second side of the connection portion is connected to a top end of the outer tubular portion in the vertical direction.

17. The combustion device as claimed in claim 16, wherein the collar assembly includes a plurality of O-rings, wherein an outer periphery of the lower tube portion opposite to the wick is provided with a plurality of grooves, wherein the plurality of the O-rings are respectively arranged in the plurality of grooves, and wherein sides of the plurality of the O-rings opposite to the ring body abut against an inner periphery of the connection tube portion.

18. The combustion device as claimed in claim 13, wherein the inner wall and the outer wall are made of glass and are transparent, wherein the wick is made of metal, and wherein the ring body is made of metal or plastic.